Individual organisms live together in an ecosystem and depend on one another. ... One category of interactions describes the different ways organisms obtain their food and energy. Some organisms can make their own food, and other organisms have to get their food by eating other organism
Also An organism’s niche is affected by both its tolerance and
competitive interactions.
• Predation, parasitism, and herbivory are interactions in
which one species benefits, while the other is harmed.
• Mutualism and commensalism are relationships in which
neither participant is harmed.